ring binder

a loose-leaf binder in which the sheets are held in by two or more rings that can be made to snap open.


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World English Dictionary
ring binder
a loose-leaf binder fitted with metal rings that can be opened to allow perforated paper to be inserted

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Otis suggests placing a laptop on a three-ring binder or other object to raise
  it up.
The prototype vaguely resembled a three-ring binder, with eight flexible,
  double-sided pages bound by an aluminum spine.
The report is written on lined notebook paper and clipped into a weathered
  three-ring binder.
If you ever tried to cram too much into a three-ring binder, you know that the
  binder sometimes falls apart in your briefcase.
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